US 12,458,378 B2 · Ultrasonic system and method having improved occlusion engagement during crossing and atherectomy procedures

Abstract

An ultrasonic system includes an ultrasonic device having an ultrasonic transducer, and a core wire having a proximal end coupled to the ultrasonic transducer and a distal end portion that terminates at a distal tip. An ultrasonic energy source is electrically connected to the ultrasonic transducer. The ultrasonic energy source includes an ultrasonic signal generator circuit, a modulator circuit, and a controller. The ultrasonic signal generator circuit generates an ultrasonic electrical signal. The modulator circuit amplitude modulates the ultrasonic electrical signal with a macro-motion electrical signal to generate a modulated ultrasonic electrical signal. The controller executes program instructions to select between an engagement mode and a transverse mode, wherein in the engagement mode the first ultrasonic electrical signal is supplied from the ultrasonic energy source to the ultrasonic transducer and in the transverse mode the modulated ultrasonic electrical signal is supplied from the ultrasonic energy source to the ultrasonic transducer.

Claims20

Dependent claims

An ultrasonic system, comprising:

an ultrasonic device having an ultrasonic transducer, and a core wire having a proximal end and a distal end portion that terminates at a distal tip, the proximal end being coupled to the ultrasonic transducer;
an ultrasonic energy source electrically connected to the ultrasonic transducer, the ultrasonic energy source including:
an ultrasonic signal generator circuit configured to generate a first ultrasonic electrical signal having a first ultrasonic frequency;
and
a modulator circuit configured to amplitude modulate the first ultrasonic electrical signal with a macro-motion electrical signal which interacts with the first ultrasonic electrical signal to generate a modulated ultrasonic electrical signal, the macro-motion electrical signal having a frequency that is at least 350 times less than the ultrasonic frequency of the first ultrasonic electrical signal;
and
a controller communicatively coupled to the ultrasonic energy source, the controller configured to execute program instructions to select between an engagement mode outputting the first ultrasonic electrical signal to anchor the distal tip in a lesion and a transverse mode outputting the modulated ultrasonic electrical signal to break up the lesion.

4 more elements

A method of operating an ultrasonic catheter coupled to an ultrasonic energy source, the ultrasonic catheter having a core wire coupled to an ultrasonic transducer, and the ultrasonic transducer being coupled to the ultrasonic energy source, the method comprising:

providing an engagement mode configured to anchor a distal tip of the ultrasonic catheter within a lesion in which the ultrasonic energy source generates an ultrasonic electrical signal having a first frequency, the ultrasonic electrical signal being supplied to the ultrasonic transducer to establish a continuous wave at an ultrasonic vibrational frequency in a distal end portion of the core wire, wherein the continuous wave produces vibrational motion of the distal end portion of the core wire that has substantially only longitudinal vibrational motion;
providing a transverse mode configured to break up the lesion with the distal tip in which the ultrasonic electrical signal is amplitude modulated with a macro-motion electrical signal having a second frequency at least 350 times less than the first frequency which interacts with the ultrasonic electrical signal to establish a modulated continuous wave at a modulated ultrasonic vibrational frequency in the distal end portion of the core wire, wherein the modulated continuous wave produces vibrational motion of the distal end portion of the core wire that has a combination of longitudinal vibrational motion and transverse vibrational motion;
operating the ultrasonic catheter in the engagement mode for a first time duration;
and
operating the ultrasonic catheter in the transverse mode for a second time duration following the first time duration of the engagement mode.

2 more elements

Dependencies are inferred from the claim text.

Ultrasonic system and method having improved occlusion engagement during crossing and atherectomy procedures

Life of this patent

Ultrasonic system and method having improved occlusion engagement during crossing and atherectomy procedures

Life of this patent

Abstract

Claims20